The Sonor Primary Line Xylophones represent German made quality at a price for small budgets. The Primary Line Xylophones feature African Rosewood bars for a deep, rich tone. All Primary Line Xylophones also feature note names and notation symbols printed on the center of each bar for easy pitch recognition plus all birch resonator boxes with 100% glued construction for outstanding resonance and sound clarity. All Primary Line diatonic units include two F# and one Bb bar plus one pair of mallets. The Sonor Primary Line Xylophones are available in diatonic units for soprano (SXP1), alto (AXP1) and deep bass (GBXP1) or in chromatic add-on units for soprano (SXP2), alto (AXP2) and deep bass (GBXP2).